Microsoft only allows a 5 X-Priority levels https://community.atlassian.com/t5/Marketplace-Apps-Integrations/Feature-request-X-Priority-header-support/td-p/1458423
Manage space
Manage content
Integrations
Microsoft only allows a 5 X-Priority levels https://community.atlassian.com/t5/Marketplace-Apps-Integrations/Feature-request-X-Priority-header-support/td-p/1458423